What is Nonparty?

Nonparty definition and meaning on Dictionary terms:
noun, plural parA.ties.
a social gathering, as of invited guests at a private home, for conversation, refreshments, entertainment, etc.: a cocktail party.
a group gathered for a special purpose or task: a fishing party; a search party.

a detachment, squad, or detail of troops assigned to perform some particular mission or service.
a group of persons with common purposes or opinions who support one side of a dispute, question, debate, etc.
a group of persons with common political opinions and purposes organized for gaining political influence and governmental control and for directing government policy: the Republican Party; the Democratic Party.
the system of taking sides on public or political questions or the like.
attachment or devotion to one side or faction; partisanship: to put considerations of party first.
Law. one of the litigants in a legal proceeding; a plaintiff or defendant in a suit. a signatory to a legal instrument. a person participating in or otherwise privy to a crime.

a person or group that participates in some action, affair, plan, etc.; participant: He was a party to the merger deal.
the person under consideration; a specific individual: Look at the party in the green velvet shorts.
a person or, usually, two or more persons together patronizing a restaurant, attending a social or cultural function, etc.: The headwaiter asked how many were in our party; a party of 12 French physicists touring the labs; a party of one at the small table.
a person participating in a telephone conversation: I have your party on the line.
any occasion or activity likened to a social party, as specified; session: The couple in the next apartment are having their usual dish-throwing party.
an advantageous or pleasurable situation or combination of circumstances of some duration and often of questionable character; period of content, license, exemption, etc.: The police broke in and suddenly the party was over for the nation’s most notorious gunman.

of or relating to a party or faction; partisan: party leaders.
of or for a social gathering: her new party dress.

being shared by or pertaining to two or more persons or things.
Heraldry. (of an escutcheon) having the field divided into a number of parts, usually two; parted.

verb (used without object), parA.tied, Informal.
to go to or give parties, especially a series of parties.
to enjoy oneself thoroughly and without restraint; indulge in pleasure.